The base game is $30 on Steam, while the complete pack with all add-ons is being sold for $50.

Enemy Unknown and Enemy Within both wowed reviewers when the games landed on Windows in late 2012 and 2013, respectively, dragging the classic turn-based strategy series into modern times by pitting your squad of grizzled, heavily armed soldiers against a seemingly never-ending horde of alien invaders. Soldiers are individuals with upgradeable stats; their deaths are permanent; and the aliens always put up a rough fight.

"If you were once an X-COM fan, buy this game," Nate Ralph wrote in PCWorld's original XCOM: Enemy Unknown review. "If you like strategy games -- particularly turn-based ones -- buy this game. In fact, I'd be hard pressed to think of a reason to steer clear."

Now that the game's available on Linux, even open-source aficionados have no reason to pass this game up.

While the addition of XCOM to the Linux legion is noteworthy, it's far from the only hit game to grace open-source shores in recent times. Heck, Civilization V became available for Linux just last week. Be sure to check out the big list of killer games that now call Linux home and keep holding your breath: Expect more top games to become Linux native as we draw closer to SteamOS's launch.

This story, "Linux gaming revolution continues as XCOM: Enemy Unknown, all add-ons hit Linux" was originally published by
PCWorld.